JQuery even()用法及代码示例

jQuery 中的 even() 方法用于从被选元素中选择偶数索引的元素。

用法:

$(selector).even()

返回值：它返回偶数索引元素。

范例1：本示例选择偶数索引列表元素。


<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        jQuery even() method
    </title>
  
    <script src=
"https://code.jquery.com/jquery-3.5.0.js">
    </script>
      
    <style>
        li {
            width:150px;
            margin:0 auto;
        }
  
        .highlight {
            background-color:green;
        }
    </style>
</head>
  
<body style="text-align:center;">
  
    <h1 style="color:green;">
        GeeksForGeeks
    </h1>
      
    <p id="GFG_UP"></p>
    <ul>
        <li>GFG_0</li>
        <li>GFG_1</li>
        <li>GFG_2</li>
        <li>GFG_3</li>
        <li>GFG_4</li>
    </ul>
    <br>
      
    <button onclick="Geeks()">
        Click here
    </button>
      
    <p id="GFG_DOWN"></p>
      
    <script>
        var elUp = document.getElementById("GFG_UP");
        var elDown = document.getElementById("GFG_DOWN");
        elUp.innerHTML = "JQuery | even() method";
          
        function Geeks() {
            $("ul li").even().addClass("highlight");
            elDown.innerHTML = 
                "The even elements are highlighted";
        } 
    </script>
</body>
  
</html>

输出：

范例2：这个例子检查了偶数索引的复选框。


<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        jQuery even() method
    </title>
  
    <script src=
"https://code.jquery.com/jquery-3.5.0.js">
    </script>
</head>
  
<body style="text-align:center;">
    <h1 style="color:green;">
        GeeksForGeeks
    </h1>
      
    <p id="GFG_UP"></p>
      
    GFG_0:<input type="checkbox" 
        id="GFG_0" value="GFG_0"><br>
      
    GFG_1:<input type="checkbox" 
        id="GFG_1" value="GFG_1"><br>
  
    GFG_2:<input type="checkbox" 
        id="GFG_2" value="GFG_2"><br>
  
    GFG_3:<input type="checkbox" 
        id="GFG_3" value="GFG_3"><br>
  
    GFG_4:<input type="checkbox" 
        id="GFG_4" value="GFG_4">
    <br><br>
      
    <button onclick="Geeks()">
        Click here
    </button>
      
    <p id="GFG_DOWN"></p>
      
    <script>
        var elUp = document.getElementById("GFG_UP");
        var elDown = document.getElementById("GFG_DOWN");
        elUp.innerHTML = "JQuery | even() method";
          
        function Geeks() {
            $("input").even().attr("checked", true);
            elDown.innerHTML = 
                "The even elements are checked";
        } 
    </script>
</body>
  
</html>

输出：

相关用法

注：本文由纯净天空筛选整理自PranchalKatiyar大神的英文原创作品 jQuery even() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。